package com.lijin.common;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

/**
 * Created by abbott-jx on 2017/9/11.
 */
public class HttpRequest {

  /**
   * 向指定URL发送GET方法的请求
   *
   * @param url 发送请求的URL
   * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
   * @return URL 所代表远程资源的响应结果
   */
  public static String sendGet(String url, String param) {
    String result = "";
    BufferedReader in = null;
    String urlNameString = null;
    try {
      if (param != null) {
        urlNameString = url + "?" + param;
      } else {
        urlNameString = url;
      }
      URL realUrl = new URL(urlNameString);
      // 打开和URL之间的连接
      URLConnection connection = realUrl.openConnection();
      // 设置通用的请求属性
      connection.setConnectTimeout(2500);//超时链接时间设置为8秒
      connection.setReadTimeout(1000);
      connection.setRequestProperty("accept", "*/*");
      connection.setRequestProperty("connection", "Keep-Alive");
      connection.setRequestProperty("X-Requested-With", "XMLHttpRequest");
      connection.setRequestProperty("User-Agent",
          "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36");

      // 建立实际的连接
      connection.connect();
      // 获取所有响应头字段
      Map<String, List<String>> map = connection.getHeaderFields();
      // 遍历所有的响应头字段
      for (String key : map.keySet()) {
        //System.out.println(key + "--->" + map.get(key));
      }
      // 定义 BufferedReader输入流来读取URL的响应
      in = new BufferedReader(new InputStreamReader(
          connection.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
        result += line;
      }
    } catch (Exception e) {
      //System.out.println("发送GET请求出现异常！" + e);
      //e.printStackTrace();
    }
    // 使用finally块来关闭输入流
    finally {
      try {
        if (in != null) {
          in.close();
        }
      } catch (Exception e2) {
        //System.out.println("解析异常！" + e2);
      }
    }
    return result;
  }

  /**
   * 向指定 URL 发送POST方法的请求
   *
   * @param url 发送请求的 URL
   * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
   * @return 所代表远程资源的响应结果
   */
  public static String sendPost(String url, String param) {
    PrintWriter out = null;
    BufferedReader in = null;
    String result = "";
    try {
      URL realUrl = new URL(url);
      // 打开和URL之间的连接
      URLConnection conn = realUrl.openConnection();
      // 设置通用的请求属性 connection.setConnectTimeout(2000);//超时链接时间设置为8秒
      conn.setConnectTimeout(2500);//超时链接时间设置为8秒
      conn.setReadTimeout(1000);
      conn.setRequestProperty("accept", "*/*");
      conn.setRequestProperty("connection", "Keep-Alive");
      conn.setRequestProperty("X-Requested-With", "XMLHttpRequest");
      conn.setRequestProperty("User-Agent",
          "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.113 Safari/537.36");
      // 发送POST请求必须设置如下两行
      conn.setDoOutput(true);
      conn.setDoInput(true);
      // 获取URLConnection对象对应的输出流
      out = new PrintWriter(conn.getOutputStream());
      // 发送请求参数
      out.print(param);
      // flush输出流的缓冲
      out.flush();
      // 定义BufferedReader输入流来读取URL的响应
      in = new BufferedReader(
          new InputStreamReader(conn.getInputStream()));
      String line;
      while ((line = in.readLine()) != null) {
        result += line;
      }
    } catch (Exception e) {
      //System.out.println("发送 POST 请求出现异常！" + e);
      // e.printStackTrace();
    }
    //使用finally块来关闭输出流、输入流
    finally {
      try {
        if (out != null) {
          out.close();
        }
        if (in != null) {
          in.close();
        }
      } catch (IOException ex) {
        //ex.printStackTrace();
        //System.out.println("解析异常！" + ex);
      }
    }
    return result;
  }
}
